We gratefully acknowledge substantial support from the following.
(These are included in a much more complete acknowledgments page.)

DARPA

National Science Foundation (Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).)

Finally, experienced users tend mostly to use the ``Index'' to lookup concepts
mentioned in error messages or vaguely remembered from their past experiences
with ACL2.

Note: If ACL2 has been installed on your local system, the HTML documentation
should also be available locally. You can minimize network traffic by
browsing your local copy. Suppose ACL2 was installed on
/usr/jones/acl2/vi-j. Then the local URL for this page is
file:/usr/jones/acl2/vi-j/acl2-sources/doc/HTML/acl2-doc.html.
Many ACL2 users set a browser bookmark to this file and use their browser to
access the documentation during everyday use of ACL2. If you obtain ACL2,
please encourage users to use the local copy of the documentation rather than
access it across the Web.

Note: The documentation is available in four forms: Postscript (which
prints as a book over 1200 pages long), HTML, EMACS Texinfo, and ACL2's own
:DOC commands. The documentation, in all but the Postscript form, is
distributed with the source code for the system. So if you have already
obtained ACL2, you should look in the doc/ subdirectory of the
directory upon which ACL2 is installed. You may obtain the gzipped Postscript
form of the documentation by clicking here (1.4
MB).

The distribution of ACL2 includes some tools built by users. Most of
these are ACL2 ``books,''
which are collections of definitions and theorems you might find
useful in your models and proofs. Most of the available books come with the distribution, but
the above link will also take you to additional books in support of the ACL2
Workshops (``workshops'') and non-standard analysis
(``nonstd'').

We also distribute a few interface
tools, such as support for infix printing. For these, see the Utilities
section of
Books and Papers about ACL2 and Its Applications. Some of the
papers mentioned in that collection contain utilities, scripts, or
ACL2 books the problem domains in question.